C8H4Cl2O2
203.02 g/mol
Industrial ChemicalDanger
Terephthaloyl chloride
CAS100-20-9EC202-829-5
Category
Industrial Chemical
Compound Class
Aromatic
Primary Use
Intermediate for synthetic fibers and resins
Terephthaloyl chloride is an organic compound used primarily as an intermediate in the production of synthetic fibers and resins. It functions as a cross-linking agent for polyurethanes and polysulfides and is also employed in the manufacture of dyes, pharmaceuticals, and rubber chemicals.
Intermediate for synthetic fibers and resinsCross-linking agent for polyurethanes and polysulfidesUsed in dye manufacture
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
SimilarStructure SimilarSimilarity 0.76
4-chlorobenzoyl chloride
CAS122-01-0
Fine chemical intermediate
SimilarStructure SimilarSimilarity 0.72
4-Fluorobenzoyl chloride
CAS403-43-0
pharmaceutical intermediate
SimilarStructure SimilarSimilarity 0.72
4-methylbenzoyl chloride
CAS874-60-2
organic synthesis intermediate
ReferenceSame Category
2-(diethylamino)ethanol
CAS100-37-8
chemical intermediate for pharmaceuticals and industrial chemicals
ReferenceSame Category
Ethylbenzene
CAS100-41-4
intermediate for styrene production
ReferenceSame Category
Styrene
CAS100-42-5
Production of polystyrene plastics and resins
ReferenceSame Category
4-vinylpyridine
CAS100-43-6
monomer for polymer synthesis
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H331Toxic if inhaled
H318Causes serious eye damage
H371May cause damage to organs
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for Terephthaloyl chloride (CAS 100-20-9) is 2917.39.
HS code (international, 6-digit)
2917.39
EU CN code (8-digit)
2917 39 85
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
benzene-1,4-dicarbonyl chloride
InChIKey
LXEJRKJRKIFVNY-UHFFFAOYSA-N
SMILES
C1=CC(=CC=C1C(=O)Cl)C(=O)Cl
Synonyms (18)
- 1,4-phthaloyl dichloride
- Terephthalic acid chloride
- Terephthalic acid dichloride
- Terephthalic dichloride
- Terephthaloyl chloride
- Terephthaloyl dichloride
- Terephthalyl dichloride
- p-Phthaloyl chloride
- p-Phthaloyl dichloride
- p-Phthalyl dichloride
- terephthalic chloride
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